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Investment Securities: (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Dec. 31, 2011
Schedule of Available-for-sale Securities [Line Items]      
Available-for-sale Securities, Gross Unrealized Gains $ 0   $ 0
Available-for-sale Securities, Gross Realized Gain (Loss) 0 0  
Debt Securities Maturity Date Range Low 2012    
Debt Securities Maturity Date Range High 2042    
Debt Securities Callable Period 1Y    
Investment securities 61,482   60,395 [1]
Federal tax-exempt debt securities [Member]
     
Schedule of Available-for-sale Securities [Line Items]      
Investment securities 40,402   39,745
Corporate Bond Securities [Member]
     
Schedule of Available-for-sale Securities [Line Items]      
Investment securities 13,176    
Available-for-sale Securities     13,263
Available-for-sale Securities     13,263
Sovereign Debt [Member]
     
Schedule of Available-for-sale Securities [Line Items]      
Investment securities 1,973    
Available-for-sale Securities     1,928
Available-for-sale Securities     1,928
Certificates of deposit [Member]
     
Schedule of Available-for-sale Securities [Line Items]      
Investment securities $ 5,931   $ 5,459
[1] December 31, 2011 balances were derived from audited consolidated financial statements.